Configure Path MTU Discovery
Configuring Path MTU Discovery on Outgoing TCP Connections
By default, path MTU discovery on outgoing TCP
connections is enabled. To disable path MTU discovery, include the no-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options] no-path-mtu-discovery;
To reenable path MTU discovery on outgoing TCP
connections, include the path-mtu-discovery statement at
the [edit system internet-options] hierarchy level:
[edit system internet-options] path-mtu-discovery;
Configuring IP-IP Path MTU Discovery on IP-IP Tunnel Connections
By default, path maximum transmission unit (MTU) discovery on outgoing IP-IP tunnel connections is enabled.
To disable IP-IP path MTU discovery, include the no-ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options] no-ipip-path-mtu-discovery;
To reenable IP-IP path MTU discovery, include the ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy
level:
[edit system internet-options] ipip-path-mtu-discovery;
Configuring Path MTU Discovery on Outgoing GRE Tunnel Connections
By default, path MTU discovery on outgoing GRE
tunnel connections is enabled. To disable GRE path MTU discovery,
include the no-gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options] no-gre-path-mtu-discovery;
To re-enable GRE path MTU discovery, include the gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy
level:
[edit system internet-options] gre-path-mtu-discovery;
To verify details of the path MTU on outgoing GRE tunnels,
use the command show interfaces (GRE).